Add binding for MagickStripImage

Per the API docs, this should strip all profiles and comments attached
to the image. This can be useful for removing identifying information
from an image (e.g. EXIF tags).

src/wand/magick.rs

@@ -374,6 +374,14 @@ impl MagickWand {
         }
     }
 
+    pub fn strip_image(&self) -> Result<()> {
+        let result = unsafe { bindings::MagickStripImage(self.wand) };
+        match result {
+            bindings::MagickBooleanType_MagickTrue => Ok(()),
+            _ => Err(MagickError("failed to strip image")),
+        }
+    }
+
     pub fn flip_image(&self) -> Result<()> {
         let result = unsafe { bindings::MagickFlipImage(self.wand) };
         match result {